Worries of the small power unit causing a fire are unwarranted.

Check the power unit for the UL, CSA, etc. listing.

The supplies are designed with internal fusing such that the worst-case scenario would simply result in a nonworking wallwart when you returned home from that vacation.

FWIW -- I have a Behringer Eurorack UB-802 here that also has no Power Switch. It has been turned on and running continually for going on five years. Of course, my entire studio chain runs from a UPS and Power Conditioner here.

I also have Mic Preamps in the studio that I NEVER turn off, preferring to keep them at operating temperature at all times so that whenever I wish to use them, I don't have to suffer through the thermal noise of tube or solid state circuit warmup. A common practice, actually, that is also used with equipments that must be kept at a calibrated point as well.

Temperature cycling and the resulting expansion/contraction involved, can often be the creator of circuit problems. Leaving units that draw very small amounts of power, such as that little Berry mixer, turned on all the time may just contribute to a longer mean lifetime before failure for the unit, provided you have properly "massaged" AC power available.


--Mac